Gray server when trying to connect

Need help i can't connect, the server seems online but i have this on the screenshot

https://gyazo.com/ccfdc0b5e9a32e298579976b901a2a4f

you need a 5.4.8 client

im using 5.4.8 client
https://gyazo.com/c76440d437375b483077fa3b9307dd8d